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Dim CustomerName As String, AcctNo As Integer, Verify As Integer 'Initialize the input variables CustomerName = "" AcctNo = 0 Do 'Enter customer's name . . . . . CustomerName = . . . 'assign a customer name 'Enter customer's account number . . . . . AcctNo = . . . 'assign an account number Verify = MsgBox("Is this correct ", 3, "Sample Message Box") Loop While Verify = 7 If Verify = 2 Then 'reset the input variables CustomerName = "" AcctNo = 0 End If 'Yes, No, Cancel
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Fig. 5.31
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The value returned by the message box determines what happens next. It the user clicks on the Yes button, the MsgBox function will return a value of 6. Hence, Verify will be assigned the value 6 and the looping action will end. On the other hand, if the user clicks on the No button, the MsgBox function will return a value of 7 and the looping action will continue. New values will therefore be assigned to CustomerName and AcctNo, and the message box will again be displayed. This looping action will continue until the user clicks on Yes, indicating satisfaction with the current values of CustomerName and AcctNo, or else clicks on Cancel, which terminates the looping action. If the user clicks on Cancel, the MsgBox function will return a value of 2. This will cause the computation to end. The If-Then block will then reset the input variables CustomerName and AcctNo to their original null values, thus cancelling the assignments made within the loop.
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The appearance of the message box can be adjusted with additional argument values. In addition, a message box can be associated with online help. Consult the Visual Basic online help for more information on these topics.
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5.8 THE InputBox FUNCTION The InputBox function is similar to the MsgBox function. However, this function is primarily intended to display a dialog box that accepts an input string, whereas the MsgBox function is primarily intended to show an output string. The dialog box generated by the InputBox function will automatically include a string prompting
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the user for input, and a text box where the user can enter an input string. It will also include two command buttons OK and Cancel. Fig. 5.32 shows a typical input box with a prompt and a blank text box, awaiting user input.
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Fig. 5.32 In general terms, the function reference may be written as
string variable = Input Box(prompt, title, default)
The first argument (prompt) represents a string that appears within the dialog box as a prompt for input. The second argument (title) represents a string that will appear in the title bar. It s default value (if not included as an explicit argument) will be the project name. The last argument (default) represents a string appearing appearing initially in the input box s text box. The default string will be empty if this last argument is not included in the function reference. When executed, the function will return the string entered by the user, and assign this string to the string variable shown on the left of the equal sign.
EXAMPLE 5.9 USING INPUT BOXES
To illustrate the use of the InputBox function, let us expand the application presented in Example 5.8. In particular, let us enter a customer name and account number via input boxes (rather than through text boxes, which is probably the most straightforward way to enter this information). We will develop a complete application that begins with the form shown in Fig. 5.33(a) and ends with a form similar to that shown in Fig. 5.33(b).
Fig. 5.33(a)
Fig. 5.33(b)
We begin with the Form Design Window shown in Fig. 5.34(a) and alter the control properties so that the Form Design Window takes on the appearance shown in Fig. 5.34(b). We then add an event procedures for each of the two command buttons. Consider the first event procedure, which is associated with the Go button. (The second event procedure simply terminates the computation, as should be obvious by now.)
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